Automatically connect on detection Ill see about that although it isnt something that has come up before. Most people want the automatic connection to take place. Problem My Ubuntu OS cannot handle two serial ports when the serial devices that are connected to the serial ports are powered on. Synopsis of symptoms When. I just got a UV5R and followed these very wellwritten instructions. Downloaded and installed the USB driver. Downloaded and installed CHIRP. Download the free trial version below to get started. Doubleclick the downloaded file to install the software. This article details how to use a Belkin FSU409 USB to Serial Converter under Windows VistaWindows 7 64bit. If youre the kind of person who spends the first ten minutes of the Lyft ride to the airport worrying that you accidentally left the oven oneven if you didnt. FTDIgate wasnt great for anybody, and now with hardware hobbyists and technological tinkerers moving away from the most popular USB to serial adapter. Two serial ports RS2. RS4. 22 conflicting with each other. USB1 crash Ubuntu. Xchanger. Last Updated November 2. AM 0 Votes. Problem My Ubuntu OS cannot handle two serial ports when the serial devices that are connected to the serial ports are powered on. Synopsis of symptoms When the two serial to USB converters are connected to the PC without any serial devices connected to them all is fine they show up as tty. HP-USB-Serial-Port.jpg' alt='Prolific Usb To Serial Driver Ubuntu' title='Prolific Usb To Serial Driver Ubuntu' />Prolific Usb To Serial Driver Ubuntu PhoneUSB0 and tty. USB1. However, as soon I connect serial devices to them, and power the serial devices on, one of the serial ports crashes it disappears from the dev directory. This is not a hardware issue or wiring issue. Something is going on in the OS that is adding gray hair to my head. Could you please assistPlease read on for details. I am running Ubuntu 1. Lenovo laptop. I am at a point where I am able to re create the error with the fewest pieces of hardware and software. The steps below recreate the problem I start the PC. Once the PC comes up, I run dmesg and save output to a file. See https pastebin. Xx. K1h. VI plug in a 2. USB device called Labjack U3. This is a fact that I dont believe is very relevant to this matter, but must be noted. I plug in RS4. 22 to USB device with nothing connected to it. I run lsusb. It is the Bus 0. Device 0. 03 ID 0. B B Electronics. Output is Bus 0. Device 0. 02 ID 8. Intel Corp. Integrated Rate Matching Hub. Bus 0. 02 Device 0. ID 8. 08. 7 0. 02. Intel Corp. Integrated Rate Matching Hub. Bus 0. 02 Device 0. ID 1d. 6b 0. 00. Linux Foundation 2. Bus 0. 01 Device 0. ID 0. 4f. 2 b. 44d Chicony Electronics Co., Ltd. Bus 0. 01 Device 0. Clarke Hess 828 Manual Lawn. ID 0a. 5c 2. 1e. Broadcom Corp. BCM2. Bluetooth 4. Think. PadBus 0. 01 Device 0. ID 8. 08. 7 0. 02. Intel Corp. Integrated Rate Matching Hub. Bus 0. 01 Device 0. ID 1d. 6b 0. 00. Linux Foundation 2. Bus 0. 04 Device 0. ID 1d. 6b 0. 00. Linux Foundation 3. Bus 0. 03 Device 0. ID 0. 85. 6 ac. 11 B B Electronics. Bus 0. 03 Device 0. ID 0cd. 5 0. 00. Lab. Jack Corporation U3. Bus 0. 03 Device 0. ID 1d. 6b 0. 00. Linux Foundation 2. I ran dmesg again. The output is here https pastebin. TGra. 1h. 7I go to dev and run ls l grep USB. The serial port shows up. USB. crw rw rw 1 root dialout 1. Nov 2. 1 1. 6 3. USB0. I power on the device attached to the RS4. Port. There is no change in the output of dev or ls l grep USB and lsusb. I connect the RS2. USB converter. The serial device is not yet connected to the converter. Ian lsusb. It is the Bus 0. Device 0. 18 ID 0. Prolific Technology, Inc. PL2. 30. 3 Serial Port device. Output is email protected dev lsusb. Bus 0. 02 Device 0. ID 8. 08. 7 0. 02. Intel Corp. Integrated Rate Matching Hub. Bus 0. 02 Device 0. ID 1d. 6b 0. 00. Linux Foundation 2. Bus 0. 01 Device 0. ID 0. 4f. 2 b. 44d Chicony Electronics Co., Ltd. Bus 0. 01 Device 0. ID 0a. 5c 2. 1e. Broadcom Corp. BCM2. Bluetooth 4. Think. PadBus 0. 01 Device 0. ID 0. 67b 2. 30. Prolific Technology, Inc. PL2. 30. 3 Serial Port. Bus 0. 01 Device 0. ID 8. 08. 7 0. 02. Intel Corp. Integrated Rate Matching Hub. Bus 0. 01 Device 0. ID 1d. 6b 0. 00. Linux Foundation 2. Bus 0. 04 Device 0. ID 1d. 6b 0. 00. Linux Foundation 3. Bus 0. 03 Device 0. ID 0. 85. 6 ac. 11 B B Electronics. Bus 0. 03 Device 0. ID 0cd. 5 0. 00. Lab. Jack Corporation U3. Bus 0. 03 Device 0. ID 1d. 6b 0. 00. Linux Foundation 2. I run the ls l grep USB command in the dev directory. Here is the output email protected dev ls l grep USB. Nov 2. 1 1. 6 3. USB0. Nov 2. 1 1. 8 4. USB1. Up to this point all is OK. I run the dmesg command to capture everything for troubleshooting. See https pastebin. ZNLtr. 6At this point is where the problem appears. I connect a serial device to the RS2. USB converter. Up to now all is still OK. I turn on power to the serial device normally this is the point where the software controlling my prototype crashes. I immediately run the ls l grep USB command many times. Here is the output email protected dev ls l grep USB. Nov 2. 1 1. 6 3. USB0. USB. Nov 2. 1 1. 6 3. USB0. email protected dev ls l grep USB. Nov 2. 1 1. 6 3. USB0. USB. Nov 2. 1 1. 6 3. USB0. email protected dev ls l grep USB. Nov 2. 1 1. 6 3. USB0. USB. Nov 2. 1 1. 6 3. USB0. email protected dev ls l grep USB. Nov 2. 1 1. 6 3. USB0. USB. Nov 2. 1 1. 6 3. USB0. email protected dev ls l grep USB. Nov 2. 1 1. 6 3. USB0. You can see that I lost one of my USB ports Now I run dmesg for a more knowledgeable person to use for diagnosis. Please see https pastebin. CYXe. Ka. 9Tested conclusions I have come to over the past 5 days The serial devices connected to the RS2. RS4. 22 work exactly as the manufacturer describes in the manuals when only one of the devices is plugged in at a time. The serial devices are not malfunctioning or broken in any way. If only one device is plugged in at a time, I can communicate with it and control it, and it behaves correctly. The wiring to all the devices is good double and triple checked using drawings and meterI have removed the USB hub I was using, and it took a long time to figure out that it was not the hubs fault. I have ruled out the various software packages I am using to read the serial data I feel that the steps outlined in this posting prove this. It is interesting to comment that this issue occurs without me even sending or receiving commands to the serial devices When I power up the device connected to the RS2. USB converter, the serial device is not yet sending messages or at least I dont believe that it is, but the serial port is immediately dropped by the operating system. Can you please let me know if this is fixable I have spent thousands of dollars buying hardware Sick LMS 2. Applied Motion Products SV7 servo drive and Servo motor and was not expecting this issue. Can you please suggest how to fix this issue As well, if I can provide any information or run any commands, please do not hesitate to let me know Thanks in advance.